Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Kollaborate.io - Start a Web Conference in just 5 seconds with sharing of documents.
Sketch - Professional digital design for Mac.
Frame.io - Video Post Production Collaboration Software
Invision - Prototyping and collaboration for design teams
Vidhub - Vidhub enables the world's best studios, corporations, and classrooms to review and discuss their videos online.